import React, {Component} from 'react';
import './Item.css'

class Item extends Component {

    state = {mouse: false}

    // 鼠标移入或移出回调
    handleMouse = (flag) => {
        return () => {
            this.setState({mouse: flag});
        }
    }

    // 勾选回调
    handleCheck = (id) => {
        return (event) => {
            this.props.updateTodo(id, event.target.checked)
        }
    }

    // 删除回调
    handleDelete = (id) => {
        if (window.confirm('确定删除吗?')) {
            this.props.deleteTodo(id)
        }
    }

    render() {
        const {id, name, done} = this.props

        const {mouse} = this.state;
        return (
            <li style={{backgroundColor: mouse ? '#ddd' : 'white'}} onMouseEnter={this.handleMouse(true)}
                onMouseLeave={this.handleMouse(false)}>
                <label>
                    <input type="checkbox" checked={done} onChange={this.handleCheck(id)}/>
                    <span>{name}</span>
                </label>
                <button onClick={() => this.handleDelete(id)} className="btn btn-danger"
                        style={{display: mouse ? 'block' : 'none'}}>删除
                </button>
            </li>
        );
    }
}

export default Item;